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<p>Extend <span class="process-math">\(f(x)\)</span> onto the interval <span class="process-math">\([-L, L]\)</span> such that <span class="process-math">\(f\)</span> is an even function, i.e., <span class="process-math">\(f(-x) = f(x)\text{,}\)</span> then extend it into a periodic function with <span class="process-math">\(2L\text{;}\)</span></p>
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